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Assumptions Used in Estimating the Fair Value of Stock Award Grants (Detail) - $ / shares
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]      
Interest rates minimum 0.03% 0.01% 0.10%
Interest rates maximum 3.60% 1.50% 2.20%
Lower Limit      
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]      
Dividends per share (quarterly amounts) $ 0.56 $ 0.51 $ 0.46
Upper Limit      
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]      
Dividends per share (quarterly amounts) $ 0.62 $ 0.56 $ 0.51